Refillable fuse



July 29. 1924. 1502.882

' M. J SANDIN REFILLABLE FUSE Filed July 1919 wfiuassss: INVENTOR Mae/r775 .150/209'0 ATTORNEY Patented July 29, 1924.

UNITED STATES PATENT OFFICE.

MAURITS .T. SAiNDIN, OF WILKINSBUBG, PENNSYLVANIA, ASSIGNOB. TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A. CORPORATION OF PENNSYL- vAma.

Application filed July 5,

To all whom it may concern:

Be it known that I, Maimirs J. SANDIN,

a citizen of the United States, and a resident of \Vilkinsburg, in the county of Refillable Fuses, of which the following is a specification.

My invention relates to fuses and particularly to refillable cartudge fuses.

-One object of my invention is to provide means for ventilating a cartridge fuse to prevent damage thereto by gas pressure, and for cooling the escaping gases to prevent damage to surrounding ob ects.

Another object of my invention is to provide a fuse cartridge that shall have relatively-movable automatic means for regulating the escape of arc gases in accordance with the pressure of-the gases.

Another object of my invention is to provide a cartridge fuse that shall have means for compensating for filling deposits in a gas-escape passage to insure the escape of the gases.

A further object of my invention is to provide a novel and effective gas-tight joint etwcen certain members of a refillable fuse cartridge.

In practicing my invention, I provide a refillable-cartridge fuse having automatic ventilating and cooling means that operates, in accordance with the gas premurc, to regulate the escape of gas and means for compensating for filling deposits incertain ventilating paths to maintain said paths 0 .n.

I further provide a novel combination of old expedients to provide a new and effective gas-tight joint. therein.

Figure 1 of the accompanying drawings is a side view, partially in elevation and partially in section, of a refillable-cartridge having a fuse embodying my invention, Fig. 2 is a transverse sectional view of a'ferrule there for. taken along the line 11-11 of Fig. 1, and Fig. 3 is a detail view of a modified form of washer embodied in my invention.

In general. my device comprises a tubular casing l. of fiber or other suitable insulating material,threaded metal end rings or collars 2 thereon for the rcccptimi of internallythrcadcd metal ferrules 3. a fusible element 4, and metal washers 5 for supporting REFILLABLE rose.

1918. Serial No. 808,686.

' the ends of the element 4 and engaging the outer end of the collar 2. v

The collars 2, having interiorly andexterioi -ly threaded portions Sand 7, respec' tively, of different diameters and surrounding exteriorly threaded and reduced portions 8 and 9 of the casin 1, are initially advanced to operative positions in gas-tight relation to the casin 1 where they are rigily and permanentFy This is a materiall better arrangement than where the collar is both threaded and comented-in position, as the cement will fail when sufiicient twisting force is applied.

Each ferrule 3 has an interiorly-thteaded portion 11 of one diameter adjacent its open end and two plain portions 12 and 13 of'successively smaller diameters relatively closely fitting a perforate metalwasher 14 and a relatively loosely'fitting' imperforate insulating washer 15, respectively. When the ferrule 3 is advanced toward the casing 1 on the collar 2,'the washer 14 engages and tightly wedges the end of the element 4 against the washer 5 to provide a good conducting path from the element 4 to the members 2 and 3. The end wall 16 of the ferrule 3 has an opening or openings 17 and an inner surface knurled portion or grooves 18 that direct the gases from the perimeter of the portion 13 to the opening 17.

The washer 15, preferably of a relatively hard and dense insulating material, such as fiber, fuller-board or other suitable material that may be slowly consumed or scored by are gases along lines opposite and following the grooves 18,, is relatively loosely disposed between the wall 16 and the washer 14 and is thereby permitted a relatively small amount of movement along its axis.

The escaping gases, caused by volatilization of the element 4, are directed through the openings in the washers 5 and 14, outwardly around the washer 15 and inwardly toward the opening 17. If the pressure of the gas is relatively high, the washer 15 will be accordingly automatically pressed held by rivets 10. i

forcibly against the wall 16 to cause the rid! t q perforation and a relatively freely and not necessarily entirely through the grooves 18.

Successive operations of the dcvire will gradually cause'a filling deposit of combusfi-tion products, such as volatilizetl metal, to

accumulate upon the sides of the grooves 18.. As compensation -for this condition. the

washer- 15 will char and gradually be indented along surfaces opposite the grooves 18, thus automatically maintr-umng open paths for the est-ape of gases.

As shown in Fig.3, the washer 1.3 may be grooved instead of the ferrule 3.

The device prevents the escape of [lame 1 therefrom, gives suflicient ventilation to prevent damage to its structure by explosive forces therein, is simple and economical in construction, and easy to-maniptilate. The arrangement, by which the ring 2 is both threaded and riveted to the casing 1, is a combination of old ,expedionts which, to"

the best of my knowledge, has not been employed in a similar manner for a similar purpose, that is, to rovide large ightl t engaging surfaces re need to occupy slig t space, as is accomplished by having the engaging aurfaces threaded to prevent the passage of gases" therebetween, and that may not be readily separated or distur ed in this relation.

While I have shown and described particular forms of my invention, changes may be efiocted therein, without departing from the spirit and scope thereof, as set forth in the a pended claims.

"t; w I c mm as my invention:

1. A cartridge fuse comprising-a member having a groove and a consumable member adjacentsaid groove to ful'll'l a gas path,

'said consumable member to be consumed direct arc gases radially between the wall and the said washer toward said opening.

3. A cartridge fuse comprising a tubular casing, an end ferrule having a transverse w'all provided with an opening and a relatively movable pressure-responsive washer disposed in direct contact with the surface of the said wall and over said opening for preventing the passage of escaping gases to the said openin except between thwall and the wadhen! npidapted' to be pressed into' more inti'm 'te ntkct with the said Wall by the no gases within the casin' 4. A cartridge fuse romprf casing having a transverse closure wall prosing a tubular movable "assure-responsive washer disposed in direct contact with the surfaceof the said wall and over said openings for preventing the passage of escaping gases to the said opening ewpt between the wall and the washer and adapted to be pressed into more intimate contact with the end wall by are 5. A cartridge fuse comprising a tubular casing having a transverse wall provided with an opening and a washer consumable by are gases passin to the said opening, the said washer being isposed in direct contact with the said wall and covering the said opening.

6. A cartridge fuse comprising a tubular casing and an end ferrule having a transverse wall groove lea in to said opening.

7. A cartri (go fuse comprising a tubular casing, an en ferrule having an opening and grooves leadin to said 0 transverse wall an a washer said opening and said grooves.

8. A cartrid 'e fuse comprising a tubular casing, an en ferrule having an opening and grooves leading to said opening in its transverse wall, an insulating washer disposed over said opening and said grooves, and a conducting washerdisposed over said insulating washer.

9. A cartrid e fuse comprising a tubular casing, an em? ferrule having an opening and radial grooves leading to said opening in its transverse wall, an inaulat' washer over said 0 ening and sai grooves ning in its isposed o'ver rovided with an opening and a disposed an a perforate con ucting washer disposed over said insulating washer.

10. In a cartridge fuse, the combination with a casing, of an and member therefor having an a ertured wall, and a member having a an: ace disposed adjacent the surface of said wall,one of said members having a groove in its surface adjacent the other member and cooperating therewith to form a gas-escape passage.

11. In a cartridge fuse having a casing, a pair of closure members havin oonti 9 surfaces one of which is provided with a groove forming 9. channel between the members leading. to an opening in one of the members whereby arc gases within the easmg are conducted between the said members to the atmosphere.

12. In acartridge fuselmving a casing, a pair of closure members having contiguous surfaces, one of which is provided with a groove forming a channel betweenthemembers and establishing communication betwee n the interior of the casing and an opening in one of be members.

lfhIn-a ca" ridge fuse having a. casing, a pa r of clourc members having contiguous surfaces, one of which is provided with a grpove forming a channel between the mem- 17. In a cartridge fuse,

bers and establishin communication between the interior 0 the casingand an opening in one of the members, one of the said members being formed of material that is, consumable by the heated gases along the line of the said groove.

14. In a cartridge fuse having a casing, a pair of closure members having transverse contiguous surfaces, one of which is provided with a groove forming a channel between the members and establishin communication between the interior of the easing and an opening in one of the members.

15. In a cartri fuse having a casing, a pair of closure members having transverse coggfuous surfaces, one of which is provi with,a groove forming a channel between the members and communicating with an opening in one of the said mem rs.

16. In a cartridge fuse having a casing, a pair pf closure members having trfn 'verse eo surfaces, one of which 1 provi with I groove extending from a! point adjacent the periphery thereof to an opening one of the members. the combination {vented wall member having a groove leading to a vent therein, of a valve covering the vent and the groove made of consum able material adapted to be partially eonsumed by the heated arc gases passing through the groove to the vent.

18. n a cartridge fuse having a casing, a pair of closure discs placed face to face, one of the members being rovided with an opening therethrou h an the adjacent face of one of the mem rs having portions in different planes whereby portions of the said disc are held out of contact by the remaining portions to (provide a passage for gases between the sai discs from or to the said openinfz.

19. n a cartridge fuse having a casing, a pair of closure discs placed face to face, the adjacent MAURITS J. SAN'DIN.

face of one of the members being I provided with portions in different planes 

